Possible Ordered States in Graphene Systems: Electronic Structure, Pseudospin Magnetism and Exciton Condensation

In this work, the authors discuss recent theoretical work in which we have proposed new types of ordered electronic states in graphene systems, including pseudospin magnets which show spontaneous charge transfer between two layers, and excitonic superfluids which could have remarkably high transition temperatures. This work concludes with some speculations on the possibility of radically new types of electronic devices in these systems whose operation is based on collective electronic behavior.